You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Donald Williams. I want to attend a music concert in San Francisco, can you please help me in booking a flight ticket?

ASSISTANT: Sure, may I know your travelling dates and airport codes?

USER: I want to start my journey from EWR and want to land in SFO. The dates are from 07/25 to 07/27.

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: Sorry to say that there is no reservation found.

USER: That's fine. Thank you for your time.

ASSISTANT: Thank you for your time.