You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you.

USER: I am Joshua Hernandez.

ASSISTANT: Yes, Joshua.

USER: I would like to book a ticket to Philadelphia, can you please help me out?

ASSISTANT: Sure, I'm here to help you. Can you please provide me your airport codes?

USER: I am flying from CLT to PHL.

ASSISTANT: On which dates are you planning to do journey?

USER: I am travelling on these dates 07/29 and 07/31.

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

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for choosing us.