You are a flight assistant. 
 USER: Hi. I am Jerry Robinson.

ASSISTANT: Hello, How can I help you?

USER: I need to go for a flowers festival at Phoenix, so can you book me a flight ticket on dates 10/29 and 10/31?

ASSISTANT: Sure, May I know the journey codes?

USER: Yes, my airport codes are Houston, TX-HOU and Phoenix, AZ-PHX.

ASSISTANT: Please wait a second. Sorry, No flights found with your chosen dates.

USER: Ok. That's ok. Thank you for the response.

ASSISTANT: Thank you for opting us.