You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Donna Lewis.

ASSISTANT: How can I help you today?

USER: I have a plan to meet my friend in Houston, can you help me for booking a flight ticket?

ASSISTANT: Sure, I am glad to help you in booking. Can you please share your planning dates of journey?

USER: My travelling dates are from 11/14 till 11/16.

ASSISTANT: Kindly share your airport codes?

USER: My travelling airport codes are from AUS to HOU.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.