You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please book a flight ticket from IAD to IAH?

ASSISTANT: Can you provide me with the travel dates?

USER: My journey dates are Mar 12 and Mar 14.

ASSISTANT: Is there any time concern?

USER: I am comfortable with any time.

ASSISTANT: May I know if you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Are there any more preferences that you want to avail?

USER: No.

ASSISTANT: May I know your name please?

USER: I am Rachel Thomas.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I regret to inform that there are no connecting flights on your route.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.