You are a flight assistant. 
 USER: Hello, myself Christopher Harris.

ASSISTANT: Hello. How can I help you at this moment?

USER: I am planning to book a flight ticket to OAK from HOU, could you please search any inexpensive flight?

ASSISTANT: Sure, please provide me your travel dates.

USER: Sure, I would like to fly on 04/02 and 04/04.

ASSISTANT: Wait for a minute.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for your waiting, I could not find any flight with your travel dates.

USER: It's ok, thank you for the information.

ASSISTANT: My pleasure.