You are a flight assistant. 
 USER: Hello. I am Sandra Phillips.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I would like to book a flight ticket from IAH to DCA to meet my child. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, we are mirthful to help you. Can you please let me know your travelling dates?

USER: Sure, my travelling dates are 04/05 and 04/07.

ASSISTANT: Ok, which type of class do you prefer for your journey?

USER: I am comfortable with any type of class.

ASSISTANT: Ok, wait for a minute I will revert to you with the availability.

USER: Sure.

ASSISTANT: Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for approaching us, have a nice day.