You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is David Perez.

ASSISTANT: How may I help you today?

USER: I am planning to attend a business meeting in Phoenix, can you help me for booking a flight ticket?

ASSISTANT: sure, I am here to help you in booking. Could you please share your trip dates?

USER: My planning dates are 02/06 and 02/08.

ASSISTANT: Could you please share your travelling airport codes?

USER: My travelling airport codes are from ORD to PHX.

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

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

ASSISTANT: Welcome, thank you for choosing us.

USER: Welcome.