You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Michelle Allen, I need to have a flight ticket reservation to Oakland for a client meet. Can you please help me about that?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Thank you for considering my request, my travelling dates are 04/25 and 04/27.

ASSISTANT: Please provide your airport codes that you want to travel.

USER: Ok, my airport codes are IAH and OAK.

ASSISTANT: Please give me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: It's ok, I will go with another agency to complete my trip. Anyways thank you for the information.

ASSISTANT: Thanks for reaching us, have a great day.