You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Myself Joshua Mitchell here. I want to travel from IAD to OAK, can you help me in doing that?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My journey dates are 06/13 to 06/15.

ASSISTANT: Do you have any preferences?

USER: I need business class airline.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Ok, no issue.

ASSISTANT: Thank you for reaching us.