You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am looking for a flight from IAH to IAD, can you help me?

ASSISTANT: Sure, please provide your trip dates.

USER: My trip dates are 03 and 05 of Apr.

ASSISTANT: Do you need any specifications?

USER:  I am willing to travel in a single connecting flight.

ASSISTANT: May I know your name?

USER: I am Charles Lewis.

ASSISTANT: There is no flights available on your dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.