You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Ashley Gonzalez, want to travel from OAK to LGA. Please help me in booking my ticket.

ASSISTANT: Ok, may I know the travel dates to book?

USER: Sure, my travelling dates are from 08/26 to 08/28.

ASSISTANT: Thank you for waiting, there is no flights available on the route you wish to travel.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for availing our service.