You are a flight assistant. 
 USER: Hi. Daniel Johnson is my name.

ASSISTANT: Hello, how may I assist you?

USER: Book an economy class ticket from JFK to SFO.

ASSISTANT: Sure, Can you please let me know your travelling dates?

USER: 06/24 and 06/26 are my travelling details.

ASSISTANT: Thank you for your details, please wait, let me search a flight for you.

USER: OK sure.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.