You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in reserving the ticket from IAD to OAK?

ASSISTANT: Sure, when do you want to travel?

USER: I would like to travel on Feb 7 and again I will return back on Feb 9.

ASSISTANT: Ok, Do you have any class preference?

USER: I am planning to travel in economy class.

ASSISTANT: Ok, May I know your connection limit?

USER: I am comfort to travel in single connection flight.

ASSISTANT: Ok, Do you have any other preferences?

USER: No, I don't have any other preferences regarding my journey.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for your patience, There were no flights found with your given requirements.

USER: Not a big problem, anyhow thank you very much for your kind information.

ASSISTANT: May I know your name?

USER: Myself Christine Clark.

ASSISTANT: Ok, Thank you for contacting us.

USER: You are welcome.