You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: I need to reserve me a ticket from IAD to AUS, can you help me in doing that?

ASSISTANT: Sure, may I know when you are planning to make your journey?

USER: My trip dates are May 24 to 26.

ASSISTANT: Can you please let me know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any more specifications in your journey?

USER: Please ensure that my return time is evening.

ASSISTANT: May I know your name please?

USER: Christine Perez here.

ASSISTANT: Sorry, there are no flights are available matching your credentials.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us.