You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Elizabeth Perez. I am having an interview at Philadelphia, can you book a ticket for me?

ASSISTANT: Sure, can you please provide us your airport codes?

USER: I am planning for catching the flight from EWR to PHL.

ASSISTANT: Ok, let me know your journey dates.

USER: I am planning to start on 01/23 and return back on 01/25.

ASSISTANT: Ok, please wait for a while. I will get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting, there is a flight available in Delta airlines and the ticket fare is 900 only. Can I book the ticket?

USER: Please check for cost 200.

ASSISTANT: Sorry Perez, no flights available with the ticket fare of 200.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for choosing us and have a nice day.

USER: You are welcome.