You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Robert Nelson.

ASSISTANT: Nelson, how may I aid you today?

USER: Can you help me by reserving a flight ticket to EWR?

ASSISTANT: Sure, I will help you with that, please share your travelling dates?

USER: I would like to fly on 03/07 and 03/09.

ASSISTANT: May I know your source airport code?

USER: My source airport code is PHL.

ASSISTANT: Nelson, sorry for the inconvenience, no flights as per your details.

USER: Ok, no issues. Thank you for your time.

ASSISTANT: You are welcome.