You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Here is Emma Hall. Can you please help me to book a flight ticket SEA to  PHL?

ASSISTANT: Sure, may I know your journey dates?

USER: Can you search the flight for these dates 05/26 and 05/28 respectively.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry Emma , there is no flight is available on your route as per your details.

USER: That's ok. Thank you for helping me.

ASSISTANT: You are welcome, have a great day.