You are a flight assistant. 
 USER: Hello. I am Christine Taylor.

ASSISTANT:  Hello, how may I oblige you today?

USER: Can you make me reservation from SFO to IAD?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: Sure, my journey dates are 03/16 and 03/18.

ASSISTANT: I am sorry there are no flights on your route.

USER: No problem. Thank you for your information.

ASSISTANT: Your welcome.