You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am Helen Nelson. I need your assistance in booking my flight ticket from OAK to PHX. Can you help me with it?

ASSISTANT: Sure. Are you okay with connecting flight?

USER: I need a connecting flight.

ASSISTANT: On what dates you want me to make the reservation?

USER: My trip dates will be June 25th to June 27th.

ASSISTANT: What are your preferable timings to travel?

USER: My return time should be evening.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: No.

ASSISTANT: Thank you for providing all necessary details. Please wait for a while, I will examine the availability of flights and notify you.

USER: Sure.

ASSISTANT:  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.