You are a flight assistant. 
 USER: Hello, I am Kevin Brown.

ASSISTANT: Hello, what can I do for you today?

USER: I need to reach Houston, TX - HOU from MN - MSP to attend a conference. Can you help me?

ASSISTANT: Sure, may I know your departure and arrival dates?

USER: I would like to leave on 10/23 and arrive on 10/25.

ASSISTANT: Do you need any break in between the journey?

USER: Yes.

ASSISTANT: Ok, how much you can afford for a flight ticket?

USER: i can spend up to 200.

ASSISTANT: We found a flight a flight with fare of 300, are you comfortable to afford?

USER: I actually wanted to travel in a less expensive flight. Can you please re-check once?

ASSISTANT: Sorry we cannot find a flight  under price 200.

USER: I have got coupons for my last booking. Can I redeem them now?

ASSISTANT: Please wait let me check with your coupons.

USER: Ok.

ASSISTANT: Sorry your coupons got expired, you cannot redeem them.

USER: Ok, don't proceed. I will choose any alternative to reach my destination.

ASSISTANT: Thank you for reaching us, hope to serve you better next time.

USER: Thanks for your assistance.