You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Christine Hill. I would like to travel from EWR to PHL, could you help me out?

ASSISTANT: Sure, can I know your travelling dates?

USER: My preferable dates are from 09-11 Sep.

ASSISTANT: Sorry, there are no flights are available for given dates.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for reaching us.