You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Pamela Mitchell here.

ASSISTANT: How may I help you?

USER: I am planning for a journey to Philadelphia. Book my flight ticket on these dates 07/10 to 07/12.

ASSISTANT: Ok, can you share your travelling airport codes?

USER: My airport codes are ATL to PHL.

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

USER: Ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.