You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ryan Miller here.

ASSISTANT: How may I assist you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Ok, please wait for a minute.

USER: Ok, I will wait.

ASSISTANT: I found your reservation and please provide me your journey dates.

USER: My travelling dates are from 07/04 to 07/06.

ASSISTANT: May I know your updates airport codes please?

USER: My airport codes are from IAH to JFK.

ASSISTANT: Please give me a minute.

USER: Make sure my connections limit is 0.

ASSISTANT: There are no flights available at this moment.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting us.