You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Samantha Campbell. I have a plan to meet my friend in Dallas, can you help me for booking a flight ticket from OAK to DFW?

ASSISTANT: Sure, I will help you in booking. Please share your trip dates.

USER: My travelling dates are from 05/31 till 06/02.

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

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.