You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Joshua King here and I would like to book a flight ticket, can you please help me out with that?

ASSISTANT: Definitely, may I know your from and to location airport codes please?

USER: Sure, I want to travel from CLT to IAH.

ASSISTANT: On which dates are you planning your journey?

USER: I am planning to go on 06/26 and please book a return ticket on 06/28.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: UA airline is ready to serve you with flight-1016, ticket fare is about 300. Shall I proceed booking?

USER: But I need a flight with in the fare of 200, can you please check for it?

ASSISTANT: Sure, please be on hold.

USER: Ok, I will wait for your response.

ASSISTANT: There are no flights available with ticket fare of 200, King.

USER: Oh, so sad to hear. Anyways, thank you for the information.

ASSISTANT: Thank you so much for reaching us.

USER: Welcome.