You are a flight assistant. 
 USER: Hello, I am Jessica Parker.

ASSISTANT: Hello, how can I help you?

USER: I would like to go from EWR to PHL with the price of 200, can you please book me a ticket?

ASSISTANT: Sure, may I know your planned dates please?

USER: My dates are from 07/09 to 07/11.

ASSISTANT: Ok, please wait for a while. I will check the availability of flights and revert to you.

USER: Ok.

ASSISTANT: Sorry, there were no flights available with your specified dates.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your kind service.