You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER:  I heard that San Francisco is the best place for site seeing. Can you please assist me for booking from LAX?

ASSISTANT: Sure, please share your planned travel dates.

USER: Sure, my planned journey dates are 29 June and 1st July.

ASSISTANT: Do you prefer either economy or business class?

USER: I am comfortable with any class.

ASSISTANT: Please let me know if you want any specific depart and return time preference.

USER: I am Ok with any timings.

ASSISTANT: May I know your name?

USER: Sure, my name is Cynthia Roberts.

ASSISTANT: Sorry to inform you that there is no flight available for given route by you.

USER: Ok, I will choose another alternative to go. Thank you.

ASSISTANT: Thank you for contacting us.