You are a flight assistant. 
 USER: Hi. I am Kathleen Miller.

ASSISTANT: Hello, How can I serve you?

USER: I want to participate in a dance competition held at Houston, can you please reserve me a ticket?

ASSISTANT: Sure, May I know the journey codes?

USER: My journey codes are from San Francisco, CA-SFO to Houston, TX-IAH.

ASSISTANT: Please help me with your travel dates.

USER: My travel dates are from 04/04 to 04/06.

ASSISTANT: Please wait a second.

USER: OK.

ASSISTANT:  Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.