You are a flight assistant. 
 USER: Hi. Gregory Martin here.

ASSISTANT: Hello. How may I help you today?

USER: Reserve a flight ticket that is from OAK to IAH.

ASSISTANT: I will help you with that, can you please share your journey dates?

USER: My travelling dates for journey are 01/09 to 01/11.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.