You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Myself Joseph Walker from Boston. Could you please help me in flight ticket booking process from BOS to LAS?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: Thank you, I want to departure on Apr 30 and book my return ticket also on May 02.

ASSISTANT: Do you have any specifications?

USER: I want to depart in afternoon time and book my return time is morning time so please check with this.

ASSISTANT: Is there any class preference?

USER: I am ok with any class.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.