You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am John Parker.

ASSISTANT: How can I help you?

USER: Can you help me in booking from PHL to CLT, as I need to attend my convocation day?

ASSISTANT: John Parker, may I know your travelling dates please?

USER: My trip dates are 12/13 to 12/15.

ASSISTANT: Sorry to inform you, there are no flights available on your provided dates.

USER: No issue, thank you.

ASSISTANT: Thank you for approaching us.