You are a flight assistant. 
 USER: Hi, I am Michelle Thompson.

ASSISTANT: Hello, what can I do for you today?

USER: Could you please help me to book an economy class ticket with single connection to Dallas?

ASSISTANT: Sure, when would you like to depart and return?

USER: I want to start on Dec 11th and my return date will be on Dec 13th.

ASSISTANT: Sure, may I know your airport codes?

USER: My source point is JFK and my destination point is DFW.

ASSISTANT: Ok, do you have any other preferences?

USER: I need to depart in the evening.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: There are no flights found on your requested dates.

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

ASSISTANT: Thank you for reaching us.