You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Rebecca Baker.

ASSISTANT: How may I help you today?

USER: Will you help me in booking the flight ticket from SFO to PHL?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My preferable journey dates are 05/19 and 05/21.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait for your response.

ASSISTANT: As per your details, there are no flights available for you on those dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a great day.