You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donald Edwards here.

ASSISTANT: How may I help you?

USER: I want to reserve my ticket within the price limit of 500, can you please help me?

ASSISTANT: Sure, I will check the flight for you. Can I have your airport codes?

USER: Ok, my respective airports codes are from MSP to SFO.

ASSISTANT: Ok, please tell me your travel dates of your journey.

USER: Sure, my planned dates of journey is from 07/28 to 07/30. Please make sure that the connections limit is 1.

ASSISTANT: Sorry to tell you, there is no flight found with in your budget in this route.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: You are welcome, thank you for reaching us.