You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I am Melissa Green. I am planning to attend for food festival on my holiday vacation at Phoenix, PHX.

ASSISTANT: Ok.

USER: Will you help me in booking a flight ticket with fare 200?

ASSISTANT: Sure, I am ravish to help you.

USER: Thank you.

ASSISTANT: May I know your starting date of journey?

USER: I would like to start my journey on 07/28.

ASSISTANT: Let me know, from where you want to board?

USER: Boston, BOS is my boarding airport code.

ASSISTANT: Do you have any requirements?

USER: I need a lay by in between my journey.

ASSISTANT: Kindly, share your return date of journey to proceed further.

USER: 07/30 will be my return date.

ASSISTANT: Please, wait for a moment.

USER: Sure.

ASSISTANT: Thank you for being patience, there is a flight available with UA airline, flight number 1018 with fare 200 and a lay by.

USER: Please, confirm my ticket with this airline.

ASSISTANT: Your reservation ha been processed.

USER: Thank you for assisting me.

ASSISTANT: Thank you for reaching us.