You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you assist me in booking a flight ticket?

ASSISTANT: Sure, for that I need your travelling dates to get a flight.

USER: My dates are 09/26 and 09/28.

ASSISTANT: Ok, let me know your locations please.

USER: My airport codes are from PHL to SFO.

ASSISTANT: Ok, may I know your name?

USER: Myself Carolyn Martin.

ASSISTANT: Sorry for the inconvenience, we don't have flight on your preferable information.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for contacting us.