You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am John Roberts here. I want to reserve my ticket from PHX to LAX, can you help me out?

ASSISTANT: Sure, we are here to help you. Can you share me your trip dates?

USER: Thank you. Sure, my planned travelling dates of journey are from Apr, 18 to Apr, 20.

ASSISTANT: Would you like to prefer business class or economy class?

USER: I am ok with any class.

ASSISTANT: Can you share me your depart time and arrival time?

USER: Sure, I need a depart time at afternoon and return time at morning.

ASSISTANT: Do you have any other preferences?

USER: Yes, I need a connecting flight.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank for your service.

ASSISTANT: You are welcome.