You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to meet my college mates, I want to book a ticket. Could you please help me out?

ASSISTANT: Sure, can you please provide me your code details of airport?

USER: Ok, my airport codes are from EWR to SFO.

ASSISTANT: Similarly, please provide your preferred travelling dates.

USER: My planned dates are from 02/22 to 02/24.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no flights available on your route, due to all flights are busy on another route.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us for booking your tickets. Can I know your good name?

USER: My name is Dennis Campbell. Thank you.

ASSISTANT: You are welcome.