You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to visit the Harvard campus in Phoenix, PHX. Can you help me with the booking process?

ASSISTANT: Sure, I am here to help you, may I know your trip dates?

USER: My trip dates are Nov 09 and 11.

ASSISTANT: Can I know your source code?

USER: My source is from Minneapolis & St. Paul, MSP.

ASSISTANT: Is there any connection limit?

USER: Yes.

ASSISTANT: Do you have any other specifications?

USER: I prefer to travel in economy class.

ASSISTANT: Can I know your good name to proceed further?

USER: Frank Campbell here.

ASSISTANT: Sorry, no flights are found on your trip dates.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.