You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I would like to fly to Denver to attend an exam, can you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, we are ecstatic to help you.

USER: Thank you.

ASSISTANT: When are you planning to make your journey?

USER: I need to depart on Mar 20th and my return date will be on Mar 22nd.

ASSISTANT: I need your selected airport code, that you wish to board from?

USER: My boarding point is IAH and my destination point is DEN.

ASSISTANT: Is there any class preference for you?

USER: No, I don't have any class preference.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: I need to depart in the afternoon.

ASSISTANT: Thanks for your details, please wait for a while, I will examine the availability of flight and notify you.

USER: Sure.

ASSISTANT: May I know your good name please?

USER: I am Robert Brown.

ASSISTANT: Robert Brown, Sorry to inform you that currently no flights are running at that locations due to abnormal weather conditions.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thanks for reaching us, wish you a nice day.